Infrared Spectroscopy Review: Uses, Molecular Vibrations, and Examples
Explore the world of infrared spectroscopy with this comprehensive review covering its uses in distinguishing compounds, information about functional groups, molecular vibrations, and detailed examples of alkane, aromatic, alkyne, alcohol, amine, ketone, aldehyde, carboxylic acid, and ester compounds. See how IR spectra can help in identifying and understanding chemical structures.
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Presentation Transcript
IR SPECTROSCOPY REVIEW
Spectroscopy & Structure All spectroscopic techniques are used in two ways: To prove that two compounds are identical A compound s spectra are unique to that compound To help establish the structure of a new compound Each spectroscopic technique provides different, important information about structure
Infrared Spectroscopy Two uses for IR IR spectra can be used to distinguish one compound from another ( fingerprint ) Information about the functional groups present in a compound Molecular Vibrations Absorption of infrared radiation corresponds to energy changes on the order of 8-40 KJ/mole (2-10 kcal/mol) The frequencies in this energy range correspond to the stretching and bending frequencies of covalent bonds, that is, changes in bond length and bond angle.
Alkane: Decane CH3(CH2)8CH3
